Looper-thread-controlling mechanism for sewing machines



Dec. 10, 1929. A. B. CLAYTON 1,733,525

LOOPER THREAD CONTROLLING MECHANISM FOR SEWING MACHINES Original Filed Jan. 28. 1928 INVENTOR Andrea/6! will! S'SES BY ATTORNEY Patented Dec. 10, 1929 NlTED STATES ANDIE/EEW B. CLAYTON, ()1? UNION, EE'W JERSEY, ASSIG-HUB TO THE SINGER MANU- FAG'FURING GUMPA'NY, OF ELIZABETH, NEW JERSEY, A COEPURATIUN 01' NEW JERSEY LOOPEIt-THHEAD-CONTRULLING MECHANISM FOR SEWING MACHINES Driginal application filed January 28, 1528, Serial No. 250,111. Divided and this application filed October this invention relates to sewing machines or the cylinder-bed chain-stitch type and has for an object to pro ide a sewing machine with simplified and compact loo oer-thread controllin mechanism particularly adapted to be housed in the restricted space within the cylinder-bed.

The looper-thread controlling mechanism comprises a cranlr-and-link take-up device disposed within and preferably crosswise ot the cylinder-bed, at the end of the mainshai t, and between the latter and the two slotted arms of the teed-and-r-eturn actuating mechanism. The anchor-link of the takeup is loosely carried by the teed-lift rockshaft.

The invention will be better understood by reterring to the accompanying drawings in which. Fig. 1 is a horizontal section through the cylinder-bed and standard. of the machine. 2 is a sectional View on the line 2, Fig. 1, and Fig. 3 is a perspective view of the looperthread-controller actuating crank.

in the preferred embodiment oi. t 1e invention illustrated, 1 represents the standard of the sewing machine which carries a cylinderbcd 2 in which is journaled in the hearings 3, l and the main-shaft 6.

The looper-thread COITllllOlllIlgdllQCllEUfllSlh comprises a crank-and-linh take-up mounted within and crosswise of the cylinder-bed at the end of: the main-shaft 6. Fixed to the inainshatt is the circular head 7 carrying the cran spin 8 which is embraced by one end of the lever-arm 9 tulcrumed at 10 to one end or": the anchor-link 11 jonrnaled freely on the feed rock-shaft 12. The lever 9 is provided with spaced sockets 13 in which are fitted the thread-arms 14 having in their free ends the thread-eyes 15. Between the arms let is mounted on the bearing-lug 16 the fixedv thrcadguide 17. At the rear of the rearwardly disposed take-up arm 1% is mounted a second lined thread-guide 18.

When the loopers 19 are "fully advanced, the movable thread-eyes are in substantial alineinent with the thread-eyes in the fixed guides 17 and 1.8. As the loopers retract, the movementof the thread-eyes 15, toward their Serial No. 312,012.

dotted line position, Fig. 2, takes up the slack looper-thread. The return movement of the thread-eyes 15 to their full line position, Fig. 2, gives up thread to the loopers in their movement to the end oi their advancing stroke.

The actuating mechanism for the loopers 19 may be of any desired construction. I prefer to use, that disclosed in my copending application, Serial No. 250,111, fi ed January 28, 1928, of which this application is a division. The loopers 19 cooperate as usual with the reciprocating needles 20.

Ihe teed rock-shaft 12 is actuated by the crank 21 and link connection 22 with the eccentric 23 on the main-shaft 6, as disclosed in my said copending application.

tlaving thus set forth the nature of the invention, what I claim herein is 1. The combination with a sewing machine having a cylinder-bed, a reciprocating needle, and a thread-carrying looper, of a looperthread controller including a crank-operated take-up lever and anchorink housed entirely within said cylinder-bed and constructed to take-up and pay out looper-thread in timed relation with the retraction and advance of the looper.

2. A sewing machine having, in combina tion, a frame including a standard, a bracket arm, and a cylinder-lied, a main-shaft journaled in said frame lengthwise of and extending into the cylinder-bed, a crank on the end of the main-shaft within the cylinderred, a reciprocating: needle, a thread-carrying loop er, a looper-thread take-up lever connected to said crank, and an anchor-link connected. at one end to said lever and at its opposite end to a fixed point within the oylindenhed.

3. A sewing machine having, in combina tion, a frame including a standard, a bracketarm, and a cylinder-bed, a reciprocating needle, a thread-carrying looper, and looperthread controlling mechanism including a crank-anddink tal e-np housed within said cyl.inder-bed and performing its movements in parallel planes transversely of the cylinder-bed.

4. A sewing machine having, in combination, a frame including a standard, a bracketarm, and a cylinder-bed, a reciprocating needle, a thread-carrying looper, a feed rocki I shaft j ournaled Within and lengthwise of the cylinder-bed, a main-shaft journaled in said frame lengthwise of and extending into said cylinder-bed, a crank on said mainshaft, a looper-thread-controlling lever connected to said crank, and an anchor-link freely connected at one end to said feed rock-shaft and at its other end to said looper-thread-controlling lever.

In testimony whereof, I have signed my name to this specification.

ANDREW B. CLAYTON. 

